Talk to me about cabin gain

[Dan17ExplLtd]

How much impact does the size of the vehicle have on cabin gain? An SUV vs a smaller 2 door coupe for example.

[nadams5755]

as the SPL folks will tell you, it varies by speaker placement, frequency, listener position, cabin size, and cabin shape. i don't know if there's any hard/fast rules for calculating it, not that i've spent any time looking for it.

there's a formula for making an old-school CRX loud that's well known.

[Grinder]

You might try asking your question again in this thread:

https://www.caraudiojunkies.com/show...-Engineer-(me)

[Grinder]

https://glasswolf.net/papers/xferfunct.html

[Dan17ExplLtd]

Thanks all!

[Justin Zazzi]

That Glasswolf guy has a nice collection of articles!

[Ge0]

That Glasswolf guy has a nice collection of articles!

And guns and pet cats .

Seriously. The guy was our Patrick Bateman of 2005 --> 2008. Smart as hell. Sometimes of the wall ideas. Always trying to be helpful.

He is the one that introduced the concept of time delayed differential rear fill to the DIYMA crowd. I implemented it into my system in 2008 and soon became an advocate to this day.

Ge0

[Blu]

Was Glasswolf the same fellow who also went by the user names Werewolf and Lycan?

[geolemon]

Yes to all the above (tech info I mean. no idea on user names).

But the [over] simplified answer is that cabin gain starts at whatever wavelength corresponds to your interior's longest dimension. So if you measure that, you can compare.
Frequencies below that are boosted about 12dB/octave from there, down.

The reason is - that's when waves stop behaving like waves, and instead start pressurizing the car uniformly, because there's no room for a "wave" to bounce around... and the wavelengths just get larger from there down.

In reality there are many, more complexities that contribute to your actual bass response (if there weren't, then this "uniformly pressurizing your interior" would mean your sub location wouldn't matter, and it does to at least a small degree), but specifically "cabin gain" is usually generally predictable from there.

[Theslaking]

there's a formula for making an old-school CRX loud that's well known.

These were considered "cheater" cars because of their amazing cabin gain and hatchback assisted horn qualities. So much that after a while you would lose respect for using this car to produce big numbers. Small Toyota trucks too. They had that big space behind the seats you could fit 15's in and the cabin gain was ridiculous.